Marquis, a Texas-based financial services provider, revealed this week that ransomware attackers stole personal data belonging to over 670,000 individuals during a cyberattack in August 2025. The incident also disrupted operations at 74 banks across the United States that rely on Marquis's services.
The breach represents a significant impact on the financial services sector, with the large number of affected individuals and the operational disruption to dozens of banking institutions. The company has not disclosed specific details about the ransomware variant used or the extent of the operational downtime experienced by the affected banks.